Adoption is of God's Grace
Source: TTT
Ezekiel 16:3–6
and tell her that this is what the Lord GOD says to Jerusalem: Your origin and your birth were in the land of the Canaanites. Your father was an Amorite and your mother a Hittite. / On the day of your birth your cord was not cut, nor were you washed with water for cleansing. You were not rubbed with salt or wrapped in cloths. / No one cared enough for you to do even one of these things out of compassion for you. Instead, you were thrown out into the open field, because you were despised on the day of your birth.
Romans 4:16, 17
Therefore, the promise comes by faith, so that it may rest on grace and may be guaranteed to all Abraham’s offspring—not only to those who are of the law, but also to those who are of the faith of Abraham. He is the father of us all. / As it is written: “I have made you a father of many nations.” He is our father in the presence of God, in whom he believed, the God who gives life to the dead and calls into being what does not yet exist.
Ephesians 1:5, 6, 11
He predestined us for adoption as His sons through Jesus Christ, according to the good pleasure of His will, / to the praise of His glorious grace, which He has freely given us in the Beloved One. / In Him we were also chosen as God’s own, having been predestined according to the plan of Him who works out everything by the counsel of His will,